At spring training, exhibition season opens with semi-pro and amateur umpires in place of major league arbiters, who are staging a collective holdout which won’t be resolved until a few weeks into the season.

On March 7, 1979 — At spring training, exhibition season opens with semi-pro and amateur umpires in place of major league arbiters, who are staging a collective holdout which won’t be resolved until a few weeks into the season.

Sources –
Baseball Reference March 7
SABR Games Project
National Pastime March 7
Retro Sheet
Replay The Game

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